Eccentric work-holder for grinding-machines.



Witnesses 'No. 855,320. i I

A. B. LANDISQ EGGENTRIG WORK Emma FOR Gmmnw ma mas.

APPLIUATION TILED NOV. 18. 1905.

ATEEWED 35m 2s, 1%?

'3 SHEETS-SHEET 1.

filaments;

No. 855,320. PATEBTTED MAX .518, 198'].

EGGENTREC WORK HOLDER FDR GRINDHIG' MAGHITIJESH APPLICATION IILED H0118, 1905.

PATENiED MAY, 28, 1967. A. B. limingx HOLDER E02 GRINDING MAG-Elms,

EUGENE APPLICATION FILED NOV. 18. 1905.

3 SHEETS-BH entrant sna es earn r rrron.

ABRAHAM s ANnis, or warnnshoao, PENNSYLVANIA.

ECCENTRlC WQRK-d-iOLDER FOR GPlNDlNG-MACHINES. I

no. ssaeeo.

Specification of Letters Patent.

Patented May 28, 1907.

Application filed November 18,1905.' Serial No. 238,050.

To all whom it may concern:

Be it known that I, ABRAHAM B. LANDIS, a citizen of the United States, residing at /Vaynesboro, in the county of Franklin and State of Pennsylvania, have invented certain. new and useful Improvements in Eccentric {VorlvHoldcrs for Grinding-Machines, of which the following is a specification.

My said invention consists in an improved construction of eccentric holding-mechanism for use on the head stocks of grinding machines for holding crank-shafts during the grinding of the wrists thereof, all as will be hereinafter more fully described and claimed.

Referring to the accompanying drawings which are made a part hereof and on which similar reference characters indicate similar parts, Figure 1 is a face view or elevation of one of the face-plates of a head-stock with my eccentric holding-attachment thereon, Fig. 2 a view partly in central section and partly in edge elevation of the same, and Fig. 3 a detail top or plan view of a portion of the table of a machine, showing the head-stocks with a crank-shaft mounted therein, in posi tion to be ground.

In said drawings the portions marked A- represent the main face-plate of the head stock, B a swiveled plate mounted thereon and C a second plate, swiveled or pivotally mounted on said swiveled plate, carrying the work-holding clamp or parts.

The main face-plate A is mounted upon a spindle 1 'andpmvided with afiange having a gear a formed thereon, with which a gear wheel 2, driven from a gear wheel 3, on a driving shaft 4, engages. A shield A is mounted over said a as is usual. Said faceplate is provided with a segmental T shaped groove a e tcndiug concentric with its periphery on tlu side opposite that carrying the holdii'lg devices and a coun tor-balance weight A adjustably secured on this part of said lace-plate by means of a clamping bolt (1 the head of which engages with said groove and the bolt proper extends through a perforation in said weight and is provided with anut on its outer end, thus permitting said weight to he moved as required to balance the other parts of the mechanism on the opposite sine of the center of said face-plate and secured in the proper position. A circular T-shaped groove a is formed in said face-- plate eccentric to the axis of the spindle and one side extending nearly to the edge of said face-plate.

The plate C is swiveled on a stud-shaft c mounted in a suitable bearing in the plate B,

to one side of its axis 1), and is held in adjusted position by means of a series of. clamping bolts 0 projecting through said plate 0 and the heads of which engage in a circular T-sl0t b in the plate B. A bracket B of the form most clearly shown in Figs. '2 and 3 is formed upon or secured to the outer edge of plate O and has a work holding clamp on its outer end consisting of a fixed jaw or rest 0 a hinged jaw C and a hinged latch-bolt C The rest C is preferably formed integral with the bracket B and has a suitable rest to receive the part of the shaft or crank to be clamped therein. The jaw C is pivoted to said part 0 on a pivot c and has a suitably formed part to engage with the opposite side of the shaft or crank to be clamped therein. The latch-bolt is mounted on a pivot c in the lower side of part U and is adapted to pass through a recess in the front ends of said parts C and C and engage by means of a nut c with the top of said part (i and clamp the work firmly between said jaw parts in said holding device. The recess between this clamping device and the plate C, within the horizontal bracket or arm B, is adapted to accommodate the disks 5 which are usually formed upon the ends of the crankshafts used in automobiles, and similar gas engine structures. Said disks C are each provided with a series of notches c in the periphery arranged to determine divisions of a circle at which said disk must be set to accommodate the different throws of the crank-shafts, which may have two, three, four or six throws at various angles. Fig. 3 shows a two throw one of its wrists. A spring latch-bolt B mounted in a socket in a bracket B on the plate B, is adapted and stop said (J plate in the desired position which is then rigidly secured by the clamping bolts 0. Said plate B is positioned by the to engage with said notches crank in position to grind IIO graduation lines shown around the left side of its face at its edge in Fig. 1, which give the throw of crank required in half inches, or as may be desired up to the extreme throw, which can be reached with the size. It will be noted that these graduations are at increasing distances apart from top to bottom, an arrangement made necessary owing to the varied movement necessary to equal changes in the throws, as will be clear.

B this means the holding device may be readily adjusted to accommodate any throw of crank, or any number of cranks on a single shaft, to bring them on a line with the center of the spindle of the main face-plate and in position to be operated upon by the grimling-wheel W.

Having thus fully described my said in vention, what I claim as new and desire to secure by Letters Patent, is

1. The combination, with the head-stock of a grinding-machine, of the face-plate, a plate swiveled. thereon at one side of its center, a second plate swiveled on said first swiveled plate eccentric to the axis thereof, and a Work holding device mounted on said second swiveled plate, substantially as set forth;

2. The combination, with the head stock of a grinding machine, of the main face-plate, a second plate pivoted thereon eccentric to the axis of said face-plate, means for adjusting, said second plate and securing it in adjusted position, a third plate pivoted on said second plate, eccentric to the axis of said second plate and carrying the work holding device, and formed with notches at intei'vals said face-plate" and secured around its periphery, and a holding detent on said pivoted late for engaging said notches, substantia i as set forth.

3. The combination with the head-stock of a grinding machine, the main faceplate formed with a circular groove in its face, the center of whieh is at one side of the axis of said face-plate, a second plate mounted on i p by clamping bolts engaging with said groove, and another plate mounted on said second plate, eccenthe driving mechanism, a second plate swiveled upon said main face-plate eccentric to the axis thereof, means for adjusting said second plate and securing it in adjusted osition and a third plate swiveled upon salt second plate, eccentric to the center thereof,

means for adjusting said third plate and see curing it in adjusted position comprising graduated notches in its periphery and a holding detent, and the work holding device mounted upon said third plate, substantially as set forth.

5. The combination with the head stock of a grinding machine, of the face-plate, the second. plate pivoted thereon eccentric to the axis thereof, clamping bolts for holding said second plate rigidly in position, a third plate pivoted on said second plate eccentric to the axis thereof, means for securing it in the desired position comprising notches around its periphery at stated intervals and a detent on the second plate to engage with said notches, and the work holding clamp mounted on said third plate, substantially as set forth.

6. The combination with the head stock of a grinding machine, of a face-(plate mounted upon the spindle and connecting to the driving mechanism, the second plate swiveled upon said face-plate eccentric to its center, the third plate mounted upon said second plate eccentric to the axis of said second plate and a bracket extending out from the face of said third plate forming a U-shaped recess and having the work holding clamp, upon its outer end, substantially as set forth.

In witness whereof, I, have hereunto set my hand and sea] at \Vaynesboro, Pennsylvania this tenth day of November, A, D. nineteen hundred and five.

ABRAHAM B. LANDIS.

Witnesses:

MERTA RUssELL, ALF. N. RUSSELL. 

